缺铁的特征是嫩叶的叶脉之间萎黄。
Iron deficiency is characterized by chlorosis between veins in young leaves.
特别注意一下中心叶脉附近的区域。
Pay particular attention to the areas right near the center vein.
递归手段重复子元素，如叶脉的排列。
Recursion means repetition in subelements, like the pattern of veins in a leaf.
反过来，这就意味着需要许多大型叶脉。
叶脉有两种：平行脉和网状脉。
叶脉把养料和水分分配给整张叶子。
叶脉结构较为复杂，主脉发达。
我们在叶子上可以看到叶脉。
而一切基于叶脉。
叶脉密度标志着树叶在这个网状结构中投入了多少。
Vein density is a sign of how much a leaf has invested in the network.
杂草中危害通常仅限于叶脉间的条状区域。
On grasses, injury is usually confined to areas between the veins.
叶片都包括表皮、叶肉和叶脉，且为等面叶。
The leaf blade consists of epidermis, mesophyll and vein, which is iso-bilateral leaf.
他们发现叶脉循环既可提高效率，又可减轻损害。
They found that as well as improving efficiency, they also help to ameliorate damage.
叶脉中木质部比重越大，越有利于水分的传输。
该理论成果对叶脉纤维的提取研究及生产实践具有重要意义。
The principle presented in this paper is of significance to leaf fiber extraction.
叶脉是一个弹性很强的分布性网络，这种原理可以应用到电网建设。
The leaf, then, is a resilient distribution network—one whose principles could be applied to, say, electricity grids.
整体设计以叶脉式动线自然的产生为设计的整体规划的主导构想。
The overall design of the leaf type line produced naturally as the leading idea of the overall planning and design.
因此叶脉——树叶的骨架决定了树叶是典型的枫叶形状还是尖刀似的柳叶形状。
So it's the veins — the skeleton of the leaf — which determine whether you will have a classic maple shape or a blade-like willow.
采下茶叶后，将其蒸青、干燥，然后深加工，去掉叶脉、梗和杂质。
When the leaves are harvested they are steamed, dried and then further processed to remove the veins, stems and impurities.
这个谜团即将揭晓。这多亏了一项新的数学模式，从叶脉角度出发探讨这个问题。
The mystery of why leaves take such different shapes is closer to being solved thanks to a new mathematical model that looks at the problem from the perspective of leaf veins.
叶脉：叶片中的维管束结构。在叶片中，所有叶脉排列的方式称脉络。
Vein One of the vascular bundles in a leaf. The pattern in which the veins are arranged in a leaf is called the VENATION.
他们认为，树木将水分输送至叶片的整个过程中，具备的总叶脉直径应当是相同的。
The idea being that the tree needs the same total vein diameter from top to bottom to properly irrigate the leaves.
如果植物需要不停地吸收水分，这有利于特定叶脉的几何分布，最终塑造树叶形状。
If a plant requires lots of water all the time, it could favor certain geometrical arrangements of veins, which starts to suggest overall leaf shapes.
本品可预防和治疗因缺锰造成的嫩叶脉间及叶尖褪绿、叶片发黄等症状。
ECO-Mn may prevent and cure the symptom include delicate vein and leaf tine fade, foliage yellowing result in lack of Mn.
叶脉中心的轴线为主要脉络，沿此设置重要公共功能分区，并向四周扩展。
As main axis, there is a main veining where the most important public functions are set up and extend to the surrounding.
在测定的30份大田病株茎杆、叶柄、叶脉样品中，阳性样品率为100%。
The rate of positive samples was 100% by the ELISA among 30 stems, petioles and veins from naturally diseased cottons.
o叶脉构成植物结构，为植物抵御破坏，甚至传送化学信号，与动物神经类似。
They provide structural support, resist damage, transport nutrients and even help send chemical signals to the plant, similar to nerves in an animal.
o叶脉构成植物结构，为植物抵御破坏，甚至传送化学信号，与动物神经类似。
They provide structural support, resist damage, transport nutrients and even help send chemical signals to the plant, similar to nerves in an animal.
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